| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| GB/T 20657-2011 | English | RFQ |
ASK
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Days<=16
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Petroleum and natural gas industries -- Equations and calculations for the properties of casing, tubing, drill pipe and line pipe used as casing and tubing
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GB/T 20657-2011
| Obsolete |
GB/T 20657-2011
|